public override void GenerateColors(ColorRGBA[] outputColors, int startIndex, int x, int y, int len)
{
ISpanInterpolator spanInterpolator = base.Interpolator;
spanInterpolator.Begin(x + base.dx, y + base.dy, len);
int c0, c1, c2;
int diameter = base.FilterLookup.Diameter;
int filter_scale = diameter << img_subpix_const.SHIFT;
int[] weight_array = FilterLookup.WeightArray;
do
{
int rx;
int ry;
int rx_inv = img_subpix_const.SCALE;
int ry_inv = img_subpix_const.SCALE;
spanInterpolator.GetCoord(out x, out y);
spanInterpolator.GetLocalScale(out rx, out ry);
AdjustScale(ref rx, ref ry);
rx_inv = img_subpix_const.SCALE * img_subpix_const.SCALE / rx;
ry_inv = img_subpix_const.SCALE * img_subpix_const.SCALE / ry;
int radius_x = (diameter * rx) >> 1;
int radius_y = (diameter * ry) >> 1;
int len_x_lr =
(diameter * rx + img_subpix_const.MASK) >>
img_subpix_const.SHIFT;
x += base.dxInt - radius_x;
y += base.dyInt - radius_y;
c0 = c1 = c2 = img_filter_const.SCALE / 2;
int y_lr = y >> img_subpix_const.SHIFT;
int y_hr = ((img_subpix_const.MASK - (y & img_subpix_const.MASK)) *
ry_inv) >> img_subpix_const.SHIFT;
int total_weight = 0;
int x_lr = x >> img_subpix_const.SHIFT;
int x_hr = ((img_subpix_const.MASK - (x & img_subpix_const.MASK)) *
rx_inv) >> img_subpix_const.SHIFT;
int x_hr2 = x_hr;
int sourceIndex;
byte[] buff = BaseGetSpan(x_lr, y_lr, len_x_lr, out sourceIndex);
for (;;)
{
int weight_y = weight_array[y_hr];
x_hr = x_hr2;
for (;;)
{
int weight = (weight_y * weight_array[x_hr] +
(int)img_filter_const.SCALE / 2) >>
DOWNSCALE_SHIFT;
c0 += buff[sourceIndex + CO.R] * weight;
c1 += buff[sourceIndex + CO.G] * weight;
c2 += buff[sourceIndex + CO.B] * weight;
total_weight += weight;
x_hr += rx_inv;
if (x_hr >= filter_scale)
{
break;
}
buff = BaseNextX(out sourceIndex);
}
y_hr += ry_inv;
if (y_hr >= filter_scale)
{
break;
}
buff = BaseNextY(out sourceIndex);
}
c0 /= total_weight;
c1 /= total_weight;
c2 /= total_weight;
//clamps..
if (c0 < 0)
{
c0 = 0;
}
else if (c0 > BASE_MASK)
{
c0 = BASE_MASK;
}
if (c1 < 0)
{
c1 = 0;
}
else if (c1 > BASE_MASK)
{
c1 = BASE_MASK;
}
if (c2 < 0)
{
c2 = 0;
}
else if (c2 > BASE_MASK)
{
c2 = BASE_MASK;
}
outputColors[startIndex].alpha = BASE_MASK;
outputColors[startIndex].red = (byte)c0;
outputColors[startIndex].green = (byte)c1;
outputColors[startIndex].blue = (byte)c2;
startIndex++;
spanInterpolator.Next();
} while (--len != 0);
}
